The Arctic Pro allows the hunter to focus on what's important. This boot's 8mm neoprene and fleece lining assures warmth in low temperatures. Like most Muck boots, a topline binding keeps the snow and cold out.*- 100% Waterproof *- 8mm Neoprene Bootie for Comfort and Performance *- Warm Fleece Lining *- Bob-Tracker Molded Outsole *- Comfort range - (-60F_-30F) *- Shaft Circumference: 17in *- Boot Height: 17.56in *- 5.4 pds